http://blogs.technet.com/b/teamdhcp/archive/2012/09/15/scope-level-link-layer-filtering-using-dhcp-policies-in-windows-server-2012.aspxIntroduction Link-layer filtering was a DHCP feature introduced in Windows Server 2008 R2 where one could allow or restrict access to clients based on their MAC address. However the caveat in this feature was that this was possible only at the serveren-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)